Precision Watch Balance Wheel Timing Screw Adjusting Tool for AP Movements. This high-quality tool is designed for fine-tuning the balance wheel timing screws in Audemars Piguet (AP) Caliber 3120, 3126, and 3090 movements. It allows for precise time regulation and movement adjustment, ensuring optimal performance in luxury watches. Designed for AP Cal. 3120, 3126, 3090 – Ensures precise movement regulation. Professional-Grade Tool – Ideal for watchmakers and horology enthusiasts. Durable Brass & Steel Build – Ensures long-lasting accuracy and reliability. Material: High-Precision Brass & Stainless Steel. Function: Adjusts balance wheel timing screws for fine-tuning accuracy. 3120 / 3126 / 3090 & other mechanical watch movements. Package Includes: 1x Watch Balance Wheel Timing Screw Adjusting Tool.